It would take some serious development from players like Chandler Stephenson and Riley Barber for them to emulate what Sheary, Rust, and Guentzel have done for Pittsburgh. Vrana could possibly step in and produce, but he's also been a healthy scratch for Hershey due to his play away from the puck frustrating Mann. Sanford was a bit closer to being an NHL contributor than Stephenson or Barber (although had yet to demonstrate being much more than a warm body in the NHL ranks), and was traded away in the Shattenkirk deal. If they could convince Gersich to turn pro late in the summer, like they did with Sanford last year, maybe he could be the diamond in the rough type.
Emulating what Pittsburgh has done with their youth is simply difficult. It takes a lot of luck to get it right. I'm not convinced the Capitals have the pieces to do it.